CN101997840B - Method, device and system for establishing differentiated services code point (DSCP) mapping relation between network elements - Google Patents

Abstract

Embodiments of the present invention provide a method, device, and system for establishing a DSCP mapping relationship between network elements. The method includes: receiving a DSCP message, and the payload of the DSCP message includes the first DSCP that needs to be detected. value, the header of the DSCP message contains the second DSCP value obtained after the first DSCP value to be detected is transmitted between the network elements; according to the first DSCP value contained in the payload of the DSCP message The DSCP value and the second DSCP value included in the header of the DSCP message establish a DSCP mapping relationship between the network elements of the first DSCP value to be detected. This method is easy to operate and maintain, efficient and fast, and can detect the mapping relationship of DSCP values between any two network elements in the entire transmission network, which greatly reduces manpower investment and can find problems more accurately. It can be used in all general IP networks. application.

Description

Method, device and system for establishing DSCP mapping relationship between network elements

technical field

The present invention relates to the field of communication technology, in particular to a method, device and system for establishing DSCP mapping relationships between network elements.

Background technique

In recent years, Internet Protocol (IP) technology has been widely used in various fields. IP transmission supports mixed transmission of multiple services, and different priorities can be set according to the types of services. Those with high priority can obtain a higher level of service and guarantee their transmission quality; those with low priority can obtain a lower level of service, and their transmission quality can only be guaranteed at a lower level, or there is no guarantee. Regarding the transmission quality, it can be evaluated by the transmission packet loss rate, transmission delay, transmission jitter and other aspects.

For wireless services, the priority service mechanism of IP technology is directly related to the experience of wireless users. 3GPP sets different priorities according to service requirements to ensure the transmission quality during the entire IP transmission process. For example, the voice service is the most delay-sensitive service, and the priority of the voice service is set to high; while the background service is the least delay-sensitive service, the priority of the background service is set to low.

IP technology uses Differentiated Services Code Point (DSCP) value to indicate differentiated service (differentiated service), and the priority of IP message is reflected by marking DSCP in the message header. Corresponding to different IP technologies, different DSCP marking methods can be used: IPv4 uses the first 6 bits of the ToS (Type of Service) field in the header, and IPv6 uses the first 6 bits of the Traffic Classes (service type) field in the header To represent. Different network elements distinguish the class of packets according to the DSCP value in the IP packet header, and provide corresponding services.

Because the priority of IP service in the network will change in different network elements, the DSCP value will have a mapping relationship between the old and new values. When a network element receives an IP packet, it modifies the DSCP value in the IP header of the packet according to the mapping relationship.

FIG. 1 is a schematic diagram of modification of a DSCP value mapping relationship in the prior art. As shown in Figure 1: If network element A receives a message with a DSCP value of 32, the DSCP value is in the range of 35 to 24 in the table entry before modification in network element A, and this range corresponds to the modified DSCP value of 24, then The DSCP value is changed from 32 to 24. When the next network element B receives a message from network element A with a DSCP value of 24, the DSCP value is in the range of 31 to 16 in the table before modification in network element B, and this range corresponds to the modified DSCP value of 16, then The DSCP value is changed from 24 to 16. Knowing the DSCP mapping relationship between two network elements is of great significance to the quality monitoring of IP transmission. The prior art adopts the following method to obtain the DSCP mapping relationship between two network elements.

Fig. 2 is a schematic diagram of multiple transmission paths between two network elements in the prior art. As shown in Figure 2, C and D respectively represent two network elements. To know the DSCP value mapping relationship between network element C and network element D, you must first know the transmission of specified services between these two network elements path (as shown in Figure 2, assuming that the actual path needs to pass through two network elements A and B); then, maintenance personnel are required to obtain the respective DSCP mapping relationships of network elements A and B on the path; finally, maintenance personnel are required to The DSCP mapping relationship between network element A and network element B is calculated, and the end-to-end DSCP mapping relationship between network element C and network element D is calculated. The specific calculation method can refer to the process shown in FIG. 1 . For network element C, the DSCP mapping relationship from point C to point D is called a forward mapping relationship, and the DSCP mapping relationship from point D to point C is called a backward mapping relationship.

There are many technical difficulties in the whole solution process of the prior art:

1. A large number of maintenance personnel are required. The entire IP transmission network is intricate, and multiple services are transmitted on one IP network at the same time. Among them, the dynamic routing of the IP network and the convergence of the intermediate network change in various ways. To obtain the current specified service transmission path requires a certain amount of manpower and high operation and maintenance costs.

2. It is necessary to invest a large number of technical experts to check whether each node on the current transmission path has modified the DSCP value and the mapping relationship of the DSCP value. There are many network element devices on a path, and the configuration of a large number of DSCP mapping tables requires a lot of manpower, and the calculation is quite difficult.

To sum up: each step of the prior art requires a lot of manual participation, which increases maintenance costs and complicates the operation of the overall process.

Contents of the invention

Embodiments of the present invention provide a method, device and system for establishing a DSCP mapping relationship between network elements.

On the one hand, an embodiment of the present invention provides a method for establishing a DSCP mapping relationship between network elements, the method comprising: receiving a DSCP message, the payload of the DSCP message includes a first DSCP value to be detected, and the The header of the DSCP message contains the second DSCP value obtained after the first DSCP value to be detected is transmitted between the network elements; according to the first DSCP value contained in the payload of the DSCP message and the The second DSCP value contained in the header of the DSCP message is used to establish a DSCP mapping relationship between the network elements of the first DSCP value to be detected.

Another aspect of the embodiment of the present invention provides a device for establishing a DSCP mapping relationship between network elements. The device includes: a DSCP message receiving unit for receiving a DSCP message. The payload of the DSCP message includes the required The detected first DSCP value, the header of the DSCP message contains the second DSCP value obtained after the first DSCP value to be detected is transmitted between the network elements; the mapping relationship establishment unit is used to The first DSCP value contained in the payload of the DSCP message and the second DSCP value contained in the header of the DSCP message, and establish the DSCP between the network elements of the first DSCP value that needs to be detected Mapping relations.

Another aspect of the embodiments of the present invention provides a system for establishing a DSCP mapping relationship between network elements, including the foregoing device as a local network element, and a peer network element as a counterpart of DSCP detection of the local network element.

The beneficial effects of the embodiments of the present invention are:

The technical solution provided by the embodiment of the present invention utilizes the mechanism that the DSCP value in the payload remains unchanged during message transmission, while the DSCP value in the message header will be changed by each network element on the transmission path, as a receiving mechanism. After receiving the DSCP message, the network element at the end receives the first DSCP value to be detected carried in the payload of the DSCP message and the second DSCP value obtained after the first DSCP value contained in the message header is transmitted between network elements. The DSCP mapping relationship among network elements of the DSCP value to be detected can be obtained. It can be seen that the technical solution provided by the embodiment of the present invention can detect the mapping relationship of DSCP values between any two network elements in the entire transmission network, which is easy to operate and maintain, efficient and fast, and greatly reduces manpower input. can be applied in both.

Description of drawings

FIG. 1 is a schematic diagram of modification of a DSCP value mapping relationship in the prior art;

FIG. 2 is a schematic diagram of multiple transmission paths between two network elements in the prior art;

Fig. 3 is the overall flowchart of the method of embodiment 1;

Fig. 4 is the activation/deactivation message frame format figure of embodiment 1;

FIG. 4a is a flow chart of the overall method of the detection execution process in Embodiment 1;

Fig. 5 is the signaling flowchart of the DSCP detection process of embodiment 1;

Fig. 6 is the overall format diagram of the message involved in the execution stage of DSCP detection in embodiment 1;

Fig. 7 is the method flowchart of the DSCP detection negotiation process of embodiment 2;

FIG. 8 is a signaling flowchart of the DSCP detection execution process in Embodiment 2;

FIG. 8a is an overall flow chart of the source end of Embodiment 2;

FIG. 8b is an overall flow chart of the destination end in Embodiment 2;

FIG. 9 is a detailed processing flow chart of the source end in Embodiment 2;

FIG. 10 is a detailed processing flowchart of the destination end in Embodiment 2;

FIG. 11 is a signaling flowchart of the DSCP detection execution process in Embodiment 3;

Fig. 11a is the overall flow chart of the source end of embodiment 3;

Fig. 11b is an overall flowchart of the destination end in Embodiment 3;

Fig. 12 is a detailed processing flowchart of the source end of embodiment 3;

FIG. 13 is a detailed processing flow chart of the source end in Embodiment 3;

Fig. 14 is one of the device schematic diagrams of embodiment 4;

Fig. 15 is the second schematic diagram of the device of embodiment 4;

Fig. 16 is the third schematic diagram of the device of embodiment 4;

Fig. 17 is the fourth of the device schematic diagram of embodiment 4;

Fig. 18 is the fifth of the device schematic diagram of embodiment 4;

Fig. 18a is a schematic diagram of the device in Fig. 18 being used to establish a forward mapping relationship;

Fig. 18b is a schematic diagram of the device in Fig. 18 being used to establish a forward mapping relationship.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Example 1:

This embodiment provides a method for establishing a DSCP mapping relationship between network elements, using the DSCP value in the payload to remain unchanged during message transmission, and the DSCP value in the message header will be transmitted by each network on the transmission path. The element change mechanism is used to establish the DSCP mapping relationship between network elements.

The method in this embodiment includes a detection execution phase, and optionally, a trigger phase and a detection negotiation phase may also be included before the detection. In the triggering phase and the detection negotiation phase, this embodiment refers to the party that triggers and starts the detection negotiation as the activating party, and the other party that cooperates with the detection negotiation process is called the activated party; in the detection execution phase, this embodiment refers to the party that initiates the detection The network element is called the source end, the network element that passively performs detection is called the destination end, the mapping relationship between the source end and the destination end is called the forward mapping relationship, and the mapping relationship between the destination end and the source end is called the backward mapping relationship. The method of the embodiment can obtain the forward mapping relationship and/or the backward mapping relationship. In addition, a network element may also be called a local network element and a peer network element. For example, a network element that establishes a DSCP mapping relationship according to a DSCP packet is called a local network element, and the opposite party is called a peer network element.

Taking the establishment of the forward mapping relationship and the backward mapping relationship at the same time as an example, the DSCP detection execution process of this embodiment includes: the source end sends a detection message to the destination end party, and the payload of the detection message and the message header Contains the DSCP value that the source needs to detect; after receiving the DSCP detection message, the destination establishes a forward mapping of the DSCP value that the source needs to detect according to the DSCP value in the payload and the DSCP value in the header relationship; then, the destination sends a probe response message to the source, the payload of the probe response message contains the forward mapping relationship, and the header of the probe response message may also contain the The DSCP value in the payload of the probe message; the source end obtains the forward mapping relationship after receiving the probe response message, and can also establish the source end according to the DSCP value in the payload and the DSCP value in the message header The backward mapping relationship of the DSCP value to be detected.

Optionally, after acquiring the forward mapping relationship, the method of this embodiment further includes: the source end sends the acquired forward mapping relationship to the destination end for verification; the destination end receives the verification message sent by the source end, and Replying the verification response message, if the verification results are inconsistent, the correct forward mapping relationship is included in the verification response message. Optionally, after acquiring the backward mapping relationship, the method in this embodiment further includes: sending the backward mapping relationship to the destination end.

Optionally, a trigger phase and a probe negotiation phase are also included before the actual detection execution process. The specific process includes: the activator triggers its own DSCP detection function, and sends an activation message to the activated party, requesting activation of the DSCP detection function; and then , according to the response of the activated party, it is judged whether the DSCP detection is successfully activated. If an activation rejection message is received, the whole process ends; if an activation response message is received, it indicates that the activated party has also activated the DSCP detection function.

The workflow of this embodiment is described in detail below. Fig. 3 is the overall flowchart of the method of the present embodiment, as shown in Fig. 3:

Step S301: the activator triggers its own DSCP detection function.

Before initiating DSCP detection negotiation to the activated party, the activator first needs to trigger its own DSCP detection function. The triggering conditions of the DSCP detection function may include: A. Manual triggering: the DSCP detection can be manually triggered at any time required. B. Automatic triggering: DSCP detection is triggered at a specific time point (configurable by the user, such as late at night), or DSCP detection is triggered periodically, and the detection cycle is configurable by the user. C. Event triggering: When a certain type of event is detected, the DSCP detection is triggered, and the detection result can be used to determine whether the event is caused by the change of the DSCP value.

Step S302: The DSCP detection negotiation process is performed between the activating party and the activated party.

The negotiation phase mainly refers to the process of establishing a detection channel between the activator and the activated party before performing the DSCP detection phase, and provides a detection channel for the subsequent detection process; when the DSCP detection work is completed or the detection process is interrupted, the two The network elements then negotiate to remove the detection channel. This process is divided into two parts: the chain establishment negotiation phase and the chain tearing negotiation phase. Described below:

1. Chain establishment negotiation phase:

The activator sends an activation command message to the activated party, requesting to establish a DSCP detection channel. Optionally, the activation command message also carries the direction of activating the DSCP detection (that is, obtains the forward mapping relationship or the backward mapping relationship or the bidirectional mapping relationship). If it does not carry the direction of the DSCP detection, the default detection direction is adopted, such as Obtain the forward mapping relationship; the activated party replies with an activation response or an activation rejection message, or the activator does not receive any response or rejection message from the activated party after sending activation command messages for multiple times in succession. The link establishment negotiation process is described in several situations as follows:

If the activator sends an "Activation Request" message, the activated party returns an "Activation Response" message, and the two parties negotiate the detection channel successfully, and then they can enter the detection execution process;

If the activator sends an "Activation Request" message and the activated party returns an "Activation Reject" message, the negotiation of the detection channel between the two parties fails and detection cannot be performed;

If the activator sends an "activation request" message, the activator does not accept the message returned by the activated party within the specified time, or does not receive the message returned by the activated party after sending the specified number of times, or within the specified time If no message from the activated party is received after sending the specified number of times, the negotiation of the detection channel between the two parties fails, and the detection cannot be performed.

2. Disassembly negotiation stage

This process can be initiated by either the activating party or the activated party, the initiating party is called the deactivating party, and the other party is called the deactivating receiver. The deactivation direction sends a deactivation command message to the deactivation receiver, requesting to remove the DSCP detection channel. In the process of unlinking negotiation, there will also be cases of unlinking success and unlinking failure. Described below:

If the deactivation party sends a "deactivation command" message, the deactivation receiver returns a "deactivation response" message, the link disconnection negotiation between the two parties is passed, and the detection channel of both parties is interrupted.

If the deactivation party does not receive a return message from the deactivation receiver within the specified time after sending the "deactivation command", or does not receive a return message from the deactivation receiver after sending the specified number of times, or If no response message is received after sending the specified number of times within the specified time, the deactivation party will forcibly remove the detection channel, and the deactivation party will not perform DSCP detection processing.

The activation/deactivation message frame format of the present embodiment is shown in FIG. 4 , and a long word (4 bytes) is added in the UDP data area, and Byte0 (byte 0) is the highest byte. The destination UDP port number (DPort) of the UDP-encapsulated activation/deactivation message can be a fixed value, such as 65020[0xFDFC], and the source UDP port number (SPort) can be a random value. The newly added 4-byte fields in the UDP data area include: message type, SN (serial number), direction, and reserved fields (fill in all unused fields with F).

The functions of the newly added 4-byte field are as follows:

Message type: used to define various command messages for activation/deactivation. Table 1 is an optional message type encoding definition method:

Table 1

encoding information command/response 0001 activation request Order 0010 activation response response 0011 Activation Denied response 0100 go activate Order 0101 deactivation response response

SN: Activation/Deactivation message stream sequence number (Sequence Number), plus one for each activation/deactivation frame sent, value range: 0～255[0xFF]

Direction: used to distinguish the direction of the command or response, Table 2 defines an optional direction code:

Table 2

encoding direction describe 0000 Do not use The default value when the direction field is not used (for example, the default is forward) 0001 Forward (activating end -> activated end) It is required to obtain the mapping relationship between the activated end and the activated end. 0010 Backward (activated end->activated end) It is required to obtain the mapping relationship between the activated terminal and the activated terminal. 0011 two-way The two parties send to each other, and the two parties are the activating end and the activated end. Both parties are required to initiate DSCP detection at the same time to obtain the bidirectional DSCP mapping relationship.

Step S303: the source end and the destination end perform a DSCP detection process.

Figure 4a is a flow chart of the overall method of the DSCP detection execution process in this embodiment, as shown in Figure 4a, the method includes:

Step S401, receiving a DSCP message, the payload of the DSCP message contains the first DSCP value to be detected, and the header of the DSCP message contains the first DSCP value to be detected. The second DSCP value obtained after inter-element transmission;

Step S402, according to the first DSCP value contained in the payload of the DSCP message and the second DSCP value contained in the header of the DSCP message, establish the first DSCP value to be detected in the DSCP mapping relationship between NEs.

FIG. 5 is a signaling flow chart of the DSCP detection process in this embodiment, and the flow chart is described by taking bidirectional detection as an example. It is worth noting that in this embodiment, the description method of the source end and the destination end is used in the detection process. From the perspective of network elements, one of the network elements can be called the local network element, and the other network element can be called as the local network element. It is called a peer network element. For example, in this embodiment, the destination end that receives a DD message may be called a local network element, and the source end is called a peer network element. As shown in Figure 5:

Step S501, the source sends a DD (DSCP Detection, DSCP detection) message.

The DD message carries the DSCP value that the source needs to detect in the UDP payload, and it is filled in the same as the DSCP value in the IP header. Waiting for reply DD ACK message. If the DD ACK message is not received, continue to send the DD message after the timeout, until the DD ACK message is still not received after sending multiple times (assuming 3 times) continuously, then report the event to inform the user that the DD ACK message cannot be received. Terminate the detection process of this DSCP.

Step S502, the destination end establishes a DSCP forward mapping relationship according to the DD message.

The destination end receives the DD message, and according to the DSCP value carried in the UDP payload of the DD message and the DSCP value of the IP header, establishes the mapping relationship of the DSCP value to be detected from the source end to the DSCP of the destination end, that is, forward Mapping relations.

Since the DSCP value carried in the payload will not change, and the DSCP value in the packet header will change according to the DSCP mapping relationship of each network element on the path, the DD packet is transmitted from the source end to the destination end. , the DSCP value of the message header may have been modified by multiple intermediate network elements. The technical solution of this embodiment does not need to know how the intermediate network elements are modified, and only needs to be based on the DSCP before modification (the DSCP contained in the payload) ) and the modified DSCP (the DSCP contained in the message header) can establish the forward mapping relationship from the source end to the destination end of the DSCP value that the source end needs to detect contained in the payload.

Step S503, the destination end replies a DD ACK response message to the source end.

Fill in the DSCP value of the IP header of the DD ACK response message with the DSCP value carried in the UDP payload of the received DD message, that is, the DSCP value that the source needs to detect; the UDP payload in the DD ACK response message carries the generated forward Mapping relations.

Step S504, the source obtains the forward mapping relationship and establishes the backward mapping relationship.

After the source end receives the DD ACK message, it obtains the mapping relationship between the source end and the destination end DSCP value from the payload of the DD ACK message, that is, the forward mapping relationship. Then, according to the DSCP value in the DD ACK message UDP payload and the DD ACK message IP header DSCP value, set up the mapping relationship of the DSCP value that the source end needs to detect from the destination end to the source end, that is, the backward mapping relationship.

Step S505, the source end sends the forward mapping relationship to the destination end for verification.

After the source end completes the detection and establishes the two-way DSCP mapping relationship table, it sends the forward mapping relationship to the destination end for verification through a DC (DSCP Checkout, DSCP checkout) message. Wait for the DC ACK response message, if it times out, continue to send, if it times out multiple times in a row (assuming 3 times), report the event, stop sending DC messages, follow-up operations The activation end can configure the entire detection result to take effect, report the result, and end the detection; You can also configure the detection result to be invalid and restart the detection process.

Step S506, the destination end performs verification, and sends the verification result to the source end.

After verifying the DSCP mapping relationship table, the destination end sends DC ACK to the source end. If the verification results are inconsistent, the destination end will feed back the correct forward mapping relationship to the source end in DC ACK.

Step S507: After receiving the DC ACK message, if the source knows that the DSCP mapping relationship is incorrect, resend the probe or modify the DSCP mapping table according to the correct value carried by the DC ACK.

Step S508, the source end sends a DSCP MAP (DM) message to inform the destination end of the DSCP mapping relationship (backward mapping relationship) of the local end.

Step S509, after receiving the DM message, the destination end replies with a DM ACK response message.

The source waits for the DM ACK response message. If it times out, it will continue to send. If it times out multiple times in a row (assuming 3 times), it will report the event and stop sending the DM message, resulting in the whole process.

The message format involved in the DSCP detection execution phase of the present embodiment is shown in Figure 6. The TOS field of the IP header of the message and the UDP payload will store the DSCP value, but the DSCP value in the UDP payload is It will not be changed by the network element, but the DSCP value of the IP header will be changed by the network element on the transmission path according to its own DSCP mapping relationship.

Optionally, the DSCP message in this embodiment implements the function of DSCP detection by extending the content of the UDP payload. For example, the DSCP value to be detected by the source end is added to the UDP payload in the DD message, and other messages in the detection execution phase are also extended in this way. This embodiment does not limit the specific packet format, as long as the DSCP detection method of this embodiment can be implemented.

In the method of this embodiment, when a peer message cannot be received, exception handling will be performed, mainly including exception handling of DD messages, DC messages, and DM messages.

1. For the timeout processing of DD messages, the number of retries is multiple times (assumed to be 3). The timeout time setting is much greater than the RTT delay and the construction delay of the peer ACK message, which can be set to 1s. If the DD detection message still does not receive the response message of the detection message after the timeout, the initiator will report the event, the detection process of other DSCP values continues, and the detection of this DSCP value is interrupted.

2. Timeout processing of the DC message. If the DC message still does not receive a response message after the timeout, the initiator reports the event, the DC process of other DSCP values continues, and the DC process of this DSCP is interrupted.

3. Timeout processing of the DM message. If the DM message still does not receive a response message after the timeout, the initiator reports the event, and the DM process of other DSCP values continues, and the DM process of this DSCP value is interrupted.

Events in this embodiment are reported in the form of messages. When an abnormal situation occurs in the detection or the DSCP mapping relationship of the detection result takes effect, the user is notified of the detection situation. One event message can report one event type, but multiple events of the same event type in one connection can be reported at the same time. Table 3 shows the event message format for the mapping relationship in this embodiment to take effect.

table 3

Type (event type) Item Number (carrying the number of events) SrcIP (source IP) DstIP (destination IP) SrcDSCP1 (source DSCP1) DstDSCP1 (Destination DSCP1) SrcDSCP2 (source DSCP2) DstDSCP2 (destination DSCP2) ... ... SrcDSCPm (source DSCPm) DstDSCPm (destination DSCPm)

The event type of this embodiment can be expanded in the manner of Table 4:

Table 4

event type DSCP detection result 0x0 DSCP activation message, no response 0x1 The activated end refuses to activate DSCP detection 0x2 DD message no response 0x4 No response to DSCP checkout message 0x5 DSCP MAP message no response 0x6 Inconsistent DC ACK packet results 0x7 The DSCP detection result is inconsistent with the last result 0x8

The meanings of other fields in Table 3 are as follows:

Item Number: Carrying the number of events, the same type of event message contains multiple events. This field indicates the number of events carried.

SrcDSCPm: In related events, the DSCP value to be detected; must be filled in.

DstDSCPm: In related events, the DSCP to be detected is mapped to the DSCP value of the peer. Except for event types 0x1, 0x2, and 0x4, fill in all Fs, other event types must fill in this field.

SrcIP: source IP.

DstIP: destination IP.

The method for establishing a DSCP mapping relationship between network elements in the embodiment of the present invention establishes a two-way DSCP mapping relationship between the source end and the destination end and from the destination end to the source end of the DSCP that needs to be detected through the DSCP message interaction process between the source end and the destination end. It can detect the mapping relationship of DSCP values between any two network elements in the entire transmission network without knowing the specific path between the two network elements. It is easy to operate and maintain, efficient and fast, greatly reducing manpower investment, and can be more accurately discovered Problem, applicable in all common IP networks.

Example 2:

This embodiment provides a method for establishing a DSCP mapping relationship between network elements. The difference from Embodiment 1 is that this embodiment only implements forward DSCP detection, that is, the DSCP value configured by the source end itself is established from the source end to the destination end. The DSCP forward mapping relationship, and inform the source end of the established DSCP forward mapping relationship. The method of this embodiment may also include the three steps shown in FIG. 3 .

Step 1: The active end triggers the DSCP detection function.

For the trigger detection function, refer to the relevant description of step S301 in Embodiment 1.

Step 2: The active end executes the DSCP detection negotiation process.

FIG. 7 is a flow chart of the method of the DSCP detection negotiation process in this embodiment. As shown in Figure 7:

In step S701, the activation terminal actively sends an activation message, requesting to establish a DSCP detection channel.

The message type of the activation message can be 0001 (Table 1), the direction is 0001 (Table 2), and the SNs are accumulated sequentially. After sending the activation message, the activator waits for the response message from the activated party. Execute corresponding steps according to the different responses of the activated party;

Step S702, if an activation response message is received, go to step S703;

Step S703, start DSCP detection;

Step S704, if the activating party does not receive a response message within the specified time, then proceed to step S705; the specified time in this step can be set to 1s.

Step S705, judging whether there is still no response after multiple consecutive sendings? If yes, go to step S706, otherwise go to step S703; in this step, the number of times of continuous sending can be set to 3 times.

Step S706, report the event, the event type is 0x1 (Table 4), the reported event carries the DSCP value that needs to be detected, and enters step S709;

Step S707, if an activation rejection message is received, go to step S708;

Step S708, report the event type as 0x2, carry the DSCP value to be detected, and enter step S709;

Step S709, terminating the DSCP detection.

Step 3: Execute the DSCP detection process:

The forward DSCP detection process of this embodiment mainly includes: the source end initiates a forward DSCP detection to the DSCP that needs to be detected, and the destination end provides the source end after establishing a forward mapping relationship table; The mapping relationship table is provided to the destination end for verification. If the verification is passed, the forward mapping relationship table will take effect. If the verification fails, the source end can choose to re-initiate the detection, or correct it according to the correct mapping relationship fed back by the destination end. Its own forward mapping relationship. It is worth noting that in this embodiment, the description method of the source end and the destination end is used in the detection process. From the perspective of network elements, one of the network elements can be called the local network element, and the other network element can be called as the local network element. It is called the peer network element. For example, in this embodiment, the destination end that receives the DD message may be called the local network element (the network element that establishes the DSCP mapping relationship), and the source end is called the peer network element. The signaling flow chart of this step is shown in Figure 8:

Step S801, the source end sends a DD packet, and the packet carries the DSCP value to be detected.

Specifically include: carry the DSCP value to be detected in the payload of the DD message (this value will not change during transmission), and carry the same DSCP value in the header of the IP message (this value may be modified by other network elements ).

Step S802, the destination establishes a forward mapping relationship.

After the destination end receives the DD message, according to the DSCP value to be detected (the first DSCP value) carried in the payload of the DD message and the DSCP value (the second DSCP value) of the IP header of the DD message received at the destination end value) to establish the DSCP mapping relationship from the source end to the destination end, that is, the forward DSCP mapping relationship.

Step S803, the destination end sends a DD ACK message to the source end.

The payload of the DD ACK message carries the forward mapping relationship (including the DSCP value carried in the payload of the DD message sent by the source and the DSCP value of the IP header of the DD message received by the destination).

Step S804, the source obtains the forward mapping relationship.

After the source end receives the DD ACK message, it extracts the two DSCP values in the message payload to obtain the forward mapping relationship of the DSCP value to be detected.

Step S805, the source end sends the obtained forward mapping relationship to the destination end for verification.

After the detection is completed, the source end establishes the forward mapping relationship of multiple DSCPs in the entire connection, and sends the multiple forward mapping relationships to the destination end through the DC message for verification. Of course, after a certain DSCP forward mapping relationship is obtained, the DSCP forward mapping relationship may be verified separately.

Step S806, the destination end returns the verification result.

After verifying the DSCP mapping relationship table, the destination end sends DC ACK to the source end. If the mapping relationship is incorrect, the correct mapping relationship will be included in the feedback DC ACK.

Optionally, the process also includes: if the DSCP mapping relationship is incorrect, the source needs to re-initiate DSCP detection, or modify the DSCP table of the local end according to the correct information carried by the DC ACK.

Fig. 8a is a flow chart of the method at the source end in this embodiment. As shown in Figure 8a:

Step S801a, sending a DSCP detection message to the destination, the header and payload of the sent detection message contain the same DSCP value that needs to be detected by the source;

Step S802a, receiving the DSCP detection response message returned by the destination end, the payload of the detection response message includes the forward mapping relationship of the DSCP value to be detected by the source end from the source end to the destination end;

Step S803a, obtaining the forward mapping relationship from the source end to the destination end of the DSCP value to be detected by the source end from the detection response message.

Fig. 8b is a flow chart of the method of the destination end in this embodiment. As shown in Figure 8b:

Step S801b, receiving the DSCP detection message sent by the source end, the payload of the received detection message contains the DSCP value that the source end needs to detect, and the header of the received detection message contains the DSCP value required by the source end. The DSCP value obtained after the detected DSCP value is transmitted from the source end to the destination end;

Step S802b, according to the DSCP value in the payload of the detection message and the DSCP value in the header of the detection message, establish a forward mapping relationship from the source end to the destination end for the DSCP value to be detected by the source end ;

Step S803b: Reply a probe response message to the source, the probe response message includes the forward mapping relationship.

Figure 9 is a detailed processing flow of the source end of this embodiment, as shown in Figure 9:

Step S901, sending a DD message, waiting to receive a DD ACK message;

Step S902, judge whether to receive DD ACK message, if not, then enter step S903, if then enter step S906;

Step S903-step S905, if the DD ACK message is not received, continue to send the DD message until the timeout expires, until it is sent multiple times in a row (assuming 3 times), and judge whether to receive the DD ACK again, if it is received, then enter step S906 ; If not received, report the event to inform the user that the DDACK message cannot be received;

Specifically, the event message type is 0x4, the number of events carried is 1, SrcIP: source IP, DstIP: destination IP, SrcDSCP: fill in the DSCP value of the request detection, DstDSCP: fill in all F, and terminate the detection of this DSCP;

Step S906-step S907, if receive DD ACK message, then set up the DSCP mapping relationship of source end to destination end, judge whether to finish the detection of all DSCP, if not then return to step S901 and continue to detect the mapping relationship of other DSCP values; Until needed The tasks of the detected DSCP value mapping relationship are all over;

Step S908, sending a DC message, and waiting for the peer to verify the detection result;

Step S909, judging whether a DC ACK message is received;

Step S910-step S912, if timeout, send multiple times continuously; judge whether a response is received after multiple sending; if no response is received after multiple sending, report the event;

Specifically, the event message type is 0x5, and the number of events is the logarithm of the DSCP mapping relationship that needs to be verified in the DC message. SrcIP: source IP, DstIP: destination IP, SrcDSCPm: fill in the DSCP value requested for detection, DstDSCPm: peer The mapped DSCP value. Terminate the detection process of this DSCP, and consider the entire detection result to be effective; send a deactivation message;

Step S913, if waiting for the DC ACK response message, determine whether the DSCP detection result is correct;

Step S914, if it is incorrect, directly modify the DSCP mapping entry, the detection process ends, and the event detection result is reported.

Specifically, the event message type is 0x0, and the number of events carried is the logarithm of the DSCP mapping relationship that needs to be verified in the message. SrcIP: source IP, DstIP: destination IP, SrcDSCPm: fill in the DSCP value of the request detection, DstDSCPm: peer The mapped DSCP value. The detection process of DSCP ends. Send a deactivation message.

Step S915, if the DSCP detection is correct, end the operation. And report the whole result.

Specifically, the event message type is 0x0, and the number of events carried is the logarithm of the DSCP mapping relationship that needs to be verified in the message. SrcIP: source IP, DstIP: destination IP, SrcDSCPm: fill in the DSCP value of the request detection, DstDSCPm: peer The mapped DSCP value. The detection process of DSCP ends. Send a deactivation message.

Step S916 sends a deactivation message;

Step S917, end the whole process.

Figure 10 is the detailed processing flow of the destination end in this embodiment, as shown in Figure 10:

Step S1001-Step S1003: After receiving the DD detection message, the destination end establishes a forward mapping relationship, and notifies the source end of the forward mapping relationship through a DD ACK response message. Specifically, the message type of the DDACK can be 0x9; the DDACK can include the following information:

SrcDSCP: Fill in the SrcDSCP value carried in the DD message; DstDSCP: Fill in the DSCP value in the IP header of the DD message received by the destination.

Step S1004-Step S1006, the destination end receives the DC message, compares it with the forward mapping relationship table established by itself, and replies DC ACK to inform the verification result. If the mapping relationship at the source end is incorrect, it needs to carry the correct one in the DC ACK Forward mapping relationship. Specifically, the message type of the DC ACK can be 0xB; the DC ACK can contain the following information:

Item Number: DSCP mapping relationship logarithm; Y/N: The value of this field is 0xFF, and the message carries the DSCP mapping pair that is not verified correctly; SrcDSCPm: DSCP value at the source end; DstDSCPm: The DSCP value at the source end corresponds to the DSCP value at the destination end , to obtain the DSCP mapping relationship for the destination. If the verification results are inconsistent, the destination will modify the DSCP value originally filled in the DSCP Checkout message.

The method of the embodiment of the present invention establishes the forward DSCP mapping relationship of the DSCP that needs to be detected from the active end to the activated end through the detection message interaction process between the active end and the activated end, and the method can detect any two network elements in the entire transmission network The mapping relationship between DSCP values between two network elements does not need to know the specific path between two network elements. It is easy to operate and maintain, efficient and fast, and greatly reduces manpower investment. It can be applied to all general IP networks.

Example 3:

This embodiment provides a method for establishing a DSCP mapping relationship between network elements. The difference from Embodiments 1 and 2 is that this embodiment only implements backward DSCP detection, that is, the source and destination detection packets are exchanged to obtain the source The backward DSCP mapping relationship of the DSCP value that the end needs to detect from the destination end to the source end. In this method, the source end establishes a backward DSCP relationship mapping table, and optionally, the source end also sends the backward DSCP relationship mapping table to the destination end. The method of this embodiment also includes the three steps in FIG. 3 .

Step 1. Trigger the DSCP detection function

For the trigger detection function, refer to the relevant description of step S301 in Embodiment 1.

Step 2: Execute the DSCP detection negotiation process. For the negotiation process, reference may be made to the description in FIG. 7 , which will not be repeated here.

Step 3: Execute the DSCP detection process.

The source initiates a probe with the DSCP that needs to be probed. After the source end establishes the backward DSCP mapping relationship table, it sends the backward detection result to the destination end. It is worth noting that in this embodiment, the description method of the source end and the destination end is used in the detection process. From the perspective of network elements, one of the network elements can be called the local network element, and the other network element can be called as the local network element. It is called a peer network element. For example, in this embodiment, the source end may be called a local network element (network element for establishing a DSCP mapping relationship), and the destination end is called a peer network element. The signaling flow diagram of this step is shown in Figure 11:

Step S1101, the source end sends a DD message, and fills in the DSCP value to be detected in the DD message payload to inform the destination end;

Step S1102, the destination end receives the DD message, and replies to the DD ACK message, the IP header and payload of the message contain the DSCP value to be detected in the DD message;

Step S1103, the DD ACK message received by the source end, according to the DSCP value in the message payload and the DSCP value of the IP header, establishes the backward DSCP mapping relationship of the DSCP value that the source end needs to detect from the destination end to the source end;

Step S1104 , after detecting all DSCP values, the source end sends the established backward DSCP mapping relationship to the destination end through a DM message.

It is understandable that a certain DSCP mapping relationship may also be sent to the destination end without waiting for all DSCP value detections to be completed.

Step S1105, after receiving the mapping relationship table, the destination end replies with a DM ACK response message.

Figure 11a is the overall flowchart of the source end of this embodiment, as shown in Figure 11a:

Step S1101a, sending a DSCP detection message to the destination, where the payload of the detection message carries the DSCP value to be detected by the source;

Step S1102a, receiving the DSCP detection response message returned by the destination end, the payload of the detection response message includes the DSCP value that the source needs to detect, and the header of the detection response message contains the The DSCP value obtained after the DSCP value that the source needs to detect is transmitted from the destination to the source;

Step S1103a, according to the DSCP value in the payload of the probe response message and the DSCP value in the header of the probe response message, establish the backward direction of the DSCP value to be detected by the source end from the destination end to the source end Mapping relations.

Figure 11b is the overall flowchart of the destination end in this embodiment, as shown in Figure 11b:

Step S1101b, receiving the DSCP detection message sent by the source end, the payload of the detection message carries the DSCP value to be detected by the source end;

Step S1102b: Returning a DSCP detection response message to the source, the payload and header of the detection response message contain the DSCP value to be detected by the source.

Figure 12 is the detailed processing flow of the source end of this embodiment, as shown in Figure 12:

Step S1201, sending a DD message, waiting to receive a DD ACK message;

Step S1202, judge whether to receive DD ACK message, if not, then enter step S1203, if then enter step S1206;

Step S1203-step S1205, if the DD ACK message is not received, continue to send the DD message after the timeout, until it is sent multiple times in a row (assuming 3 times), and judge whether to receive the DD ACK again, and report the event if not received Inform the user that the DD ACK message cannot be received;

Specifically, the event message type is 0x4, and the number of carried events is 1, SrcIP: source IP, DstIP: destination IP, SrcDSCPm: fill in the DSCP value of the request detection, DstDSCP: fill in all F. Terminate the detection processing of this DSCP;

Step S1206-step S1207, if a DD ACK message is received, then establish the backward DSCP mapping relationship from the destination end to the source end, and continue to detect the mapping relationship of other DSCP values until the tasks of the DSCP value mapping relationship that need to be detected are all over;

Step S1208, sending DSCP Map message;

Step S1209, judging whether a DM ACK message is received;

Step S1210, if no response is received within timeout, report the event; and enter step S1212;

Specifically, the event message type is 0x6, and the number of events carried is the logarithm of the DSCP mapping relationship that needs to be verified in the DSCP Map message. SrcIP: source IP, DstIP: destination IP, SrcDSCPm: fill in the DSCP value of the request detection, DstDSCPm: yes The DSCP value of the port mapping;

Step S1211, if the waiting DM ACK response message is received, report the event detection result. The event message type is 0x0, and the number of events carried is the logarithm of the DSCP mapping relationship that needs to be verified in the message. SrcIP: source IP, DstIP: destination IP, SrcDSCPm: fill in the DSCP value requested for detection, DstDSCPm: DSCP mapped by the peer value;

Step S1212, sending a deactivation message. The detection process of DSCP ends.

Figure 13 is the detailed processing flow of the destination end in this embodiment, as shown in Figure 13:

Step S1301-step S1302, receive the DD detection message, reply the DD ACK message to the active end, and include the DSCP value to be detected in the message header and the payload;

Step S1303-step S1305, receiving the DSCP MAP message, obtaining the DSCP mapping relationship from the activated end to the active end from the DM message, and sending a DM ACK response message.

The method of the embodiment of the present invention establishes the backward DSCP mapping relationship of the DSCP that needs to be detected from the destination end to the source end through the detection message interaction process between the source end and the destination end, and the method can detect the DSCP between any two network elements in the entire transmission network The value mapping relationship does not need to know the specific path between two network elements. It is easy to operate and maintain, efficient and fast, and greatly reduces manpower investment. It can be applied to all general IP networks.

Example 4:

This embodiment provides a device for establishing a DSCP mapping relationship between network elements. The device can be located in any network element of an IP network. The device in this embodiment detects by sending a detection message from the source end and replying a detection response message from the destination end. For the DSCP mapping relationship between network elements, the device in this embodiment may be located at the source end or at the destination end or be an independent network element.

FIG. 14 is one of the schematic diagrams of the device in this embodiment. The device in FIG. 14 can realize the detection of the forward DSCP mapping relationship at the source end.

As shown in Figure 14: the device 31 includes: a probe message sending unit 310, which is used to send a DSCP probe message to the destination, and the header and payload of the probe message sent contain the same DSCP that needs to be probed value; the detection response message receiving unit 311 is used to receive the DSCP detection response message returned by the destination end, and the payload of the detection response message contains the forward direction of the DSCP value to be detected from the source end to the destination end Mapping relationship; forward mapping relationship acquiring unit 312, configured to acquire the mapping relationship of the DSCP value to be detected from the source end to the destination end from the response message.

Optionally, the device 31 further includes: a detection trigger unit 313, configured to trigger a DSCP detection function of the device. Optionally, the device in FIG. 31 further includes: a link establishment negotiation unit 314, configured to negotiate with the destination end to establish a communication link for DSCP detection before sending a DSCP detection message to the destination end; a link disconnection negotiation unit 315, used to After the DSCP detection process ends or the detection process is interrupted, it negotiates with the destination end to remove the communication link of the DSCP detection.

Optionally, the device 31 further includes: a verification message sending unit 316, configured to send a mapping relationship verification message to the destination, the verification message including the acquired forward mapping relationship; a verification response The receiving unit 317 is configured to receive the verification response message returned by the destination, and the verification response message includes the correct forward mapping relationship; the correction unit 318 is configured to pair the The forward mapping relationship obtained from the DSCP detection response message is corrected. For the working principle of the device 31, refer to the working principle of the source end in Embodiment 2, and will not be described in detail here.

FIG. 15 is the second schematic diagram of the device in this embodiment. The device in FIG. 15 can realize the detection of the forward DSCP mapping relationship at the destination end under the activation of the source end.

As shown in FIG. 15 , the device 32 includes: a detection message receiving unit 320, configured to receive a DSCP detection message sent by the source end, the payload of the detection message includes the DSCP value that the source end needs to detect, so The message header of the detection message contains the DSCP value obtained after the DSCP value to be detected by the source end is transmitted from the source end to the destination end; the forward mapping relationship establishment unit 321 is used for netting according to the detection message The DSCP value in the load and the DSCP value in the message header of the detection message establish the forward mapping relationship of the DSCP value that the source end needs to detect from the source end to the destination end; the detection response message sending unit 322 uses and replying a probe response message to the source, where the probe response message includes the forward mapping relationship.

Optionally, the device 32 further includes: a link establishment negotiation unit 323, configured to negotiate with the source end to establish a communication link for DSCP detection before receiving the DSCP detection message; a link disconnection negotiation unit 324, configured to After the DSCP detection process ends or the detection process is interrupted, negotiate with the source to remove the communication link of the DSCP detection.

Optionally, the device 32 further includes: a verification message receiving unit 325, configured to receive a mapping relationship verification message sent by the source end, and the mapping relationship verification message includes the front end of the DSCP value acquired by the source end. to the mapping relationship (can be one or more); checking unit 326, used to compare whether the forward mapping relationship contained in the mapping relationship verification message is consistent with the forward mapping relationship established by itself; the verification response report A text sending unit 327, configured to return a verification response message to the source, and if inconsistent, include the correct forward mapping relationship in the verification response message. For the working principle of the device 32, refer to the working principle of the destination end in Embodiment 2, and will not be described in detail here.

FIG. 16 is the third schematic diagram of the device in this embodiment. The device in FIG. 16 can realize the detection of the backward DSCP mapping relationship at the source end.

As shown in Figure 16, the device 33 includes: a probe message sending unit 330, configured to send a DSCP probe message to the destination end, the probe message carrying the DSCP value that the source end needs to detect; a probe response message receiving unit 331. It is used to receive a DSCP detection response message returned by the destination end, the payload of the detection response message includes the DSCP value that the source needs to detect, and the header of the detection response message includes The DSCP value that the source end needs to detect is transmitted from the destination end to the DSCP value obtained after the source end; the backward mapping relationship establishment unit 332 is used for according to the DSCP value in the payload of the detection response message and the detection response The DSCP value in the packet header of the message establishes a backward mapping relationship from the destination end to the source end for the DSCP value to be detected by the source end.

Optionally, the device 33 further includes: a link establishment negotiation unit 333, configured to negotiate with the destination end to establish a communication link for DSCP detection before receiving the DSCP detection message; a link disconnection negotiation unit 334, configured to After the DSCP detection process ends or the detection process is interrupted, it negotiates with the destination end to remove the communication link of the DSCP detection.

Optionally, the device 33 further includes: a backward mapping relationship sending unit 335, configured to send the established backward mapping relationship to the destination end. For the working principle of the device 33, refer to the working principle of the source in Embodiment 3, and will not be described in detail here.

FIG. 17 is a fourth schematic diagram of the device in this embodiment. The device in FIG. 17 can realize the detection of the backward DSCP mapping relationship at the destination end under the activation of the source end.

As shown in FIG. 17 , the device 34 includes: a detection message receiving unit 340, configured to receive a DSCP detection message sent by the source, wherein the payload of the detection message carries the DSCP value that the source needs to detect; the detection response The message sending unit 341 is configured to return a DSCP detection response message to the source, where the payload and header of the detection response message contain the DSCP value that the source needs to detect.

Optionally, the device 33 further includes: a link establishment negotiation unit 342, configured to negotiate with the source end to establish a communication link for DSCP detection before receiving the DSCP detection message; a link disconnection negotiation unit 343, configured to After the DSCP detection process ends or the detection process is interrupted, negotiate with the source to remove the communication link of the DSCP detection.

Optionally, the device 34 further includes: a backward mapping relation receiving unit 344, configured to receive the backward mapping relation from the destination end to the source end of the DSCP value to be detected sent by the source end. For the working principle of the device 34, please refer to the working principle of the destination end in Embodiment 3, and will not be described in detail here.

Fig. 18 is the fifth schematic diagram of the device of this embodiment, the device can realize the establishment of the forward mapping relationship and the establishment of the backward mapping relationship.

As shown in Figure 18, the device 35 includes: a DSCP message receiving unit 350, configured to receive a DSCP message, the payload of the DSCP message includes the first DSCP value to be detected, and the DSCP message's The message header contains the second DSCP value obtained after the first DSCP value that needs to be detected is transmitted between the network elements; the mapping relationship establishment unit 351 is configured to, according to the first DSCP value contained in the payload of the DSCP message, The DSCP value and the second DSCP value included in the header of the DSCP message establish a DSCP mapping relationship between the network elements of the first DSCP value to be detected.

Fig. 18a and Fig. 18b respectively correspond to schematic diagrams of devices for establishing forward and backward mapping relationships, and Fig. 18a and Fig. 18b will be described in detail below.

(1) As shown in Figure 18a, when the DSCP mapping relationship between the network elements is: the opposite end network element (in this embodiment, the detection activation end is used as the opposite end network element), the first DSCP value to be detected is obtained from the opposite end When the DSCP forward mapping relationship between the network element and the local network element; the device 35a shown in Figure 18a includes:

The DSCP message receiving unit 350a is configured to receive the DSCP detection message sent by the peer network element, the payload of the DSCP detection message includes the first DSCP value that the peer network element needs to detect, and the DSCP detection message The message header of the message contains the second DSCP value obtained after the first DSCP value is transmitted from the peer network element to the local network element; the mapping relationship establishment unit 351a is used to detect the DSCP value in the message payload according to the DSCP The first DSCP value and the second DSCP value in the header of the DSCP detection message establish a DSCP forward mapping relationship of the first DSCP value to be detected by the peer network element from the peer network element to the local network element .

Optionally, the device 35a further includes: a DSCP message sending unit 352a, configured to reply a DSCP detection response message to the peer network element, and the DSCP detection response message includes the DSCP forward mapping relationship.

Optionally, the device 35a further includes: a verification unit 353, configured to receive a DSCP mapping relationship verification message sent by the peer network element, and the mapping relationship verification message includes the DSCP mapping relationship verification message obtained by the peer network element. The DSCP forward mapping relationship; compare whether the DSCP forward mapping relationship contained in the mapping relationship verification message is consistent with the DSCP forward mapping relationship established by the local network element; return to the peer network element If the verification response message is inconsistent, the correct DSCP forward mapping relationship is included in the verification response message.

Optionally, the device 35a further includes: a link establishment negotiation unit 355a, configured to negotiate with the peer network element to establish a communication link for DSCP detection before performing DSCP detection; and/or, a link disconnection negotiation unit 356a, configured to After the DSCP detection process ends or the detection process is interrupted, it negotiates with the peer network element to remove the communication link of the DSCP detection.

Optionally, the device 35a further includes: a detection trigger unit 357a, configured to trigger its own DSCP detection function before negotiating with the peer network element to establish a communication link for DSCP detection when the device acts as a DSCP detection activator .

(2) As shown in Figure 18b, when the DSCP mapping relationship between the network elements is: the first DSCP value to be detected by the local network element (the detection activation end is used as the local network element in this embodiment) is obtained from the opposite end When the DSCP backward mapping relationship between the network element and the local network element; the device 35b shown in Figure 18b includes:

The DSCP message receiving unit 350b is configured to receive the DSCP detection response message returned by the peer network element, the payload of the DSCP detection response message includes the first DSCP value that the local network element needs to detect, and the DSCP The message header of the detection response message contains the second DSCP value obtained after the first DSCP value is transmitted from the peer network element to the local network element; the mapping relationship establishment unit 351b is used to detect the response message according to the DSCP The first DSCP value contained in the payload and the second DSCP value contained in the header of the DSCP detection response message are used to establish the first DSCP value to be detected by the local network element from the peer network element to the local network The DSCP backward mapping relationship of the element.

Optionally, the device 35b further includes: a DSCP message sending unit 352b, configured to send a DSCP detection message to the peer network element, and the payload of the DSCP detection message carries the first DSCP message to be detected by the local network element. a DSCP value.

Optionally, the device 35b further includes: a mapping relationship sending unit 354, configured to send the established backward DSCP mapping relationship to the peer network element.

Optionally, the device 35b further includes: a link establishment negotiation unit 355b, configured to negotiate with the peer network element to establish a communication link for DSCP detection before performing DSCP detection; and/or, a link disconnection negotiation unit 356b, used to After the DSCP detection process ends or the detection process is interrupted, it negotiates with the peer network element to remove the communication link of the DSCP detection.

Optionally, the device 35b further includes: a detection trigger unit 357b, configured to trigger its own DSCP detection function before negotiating with the peer network element to establish a communication link for DSCP detection when the device acts as a DSCP detection activator .

The device in the embodiment of the present invention establishes the DSCP mapping relationship from the source end to the destination end and from the destination end to the source end of the DSCP that needs to be detected through the detection message interaction process between the source end and the destination end. The mapping relationship of DSCP values between network elements does not need to know the specific path between two network elements. It is easy to operate and maintain, efficient and fast, greatly reducing manpower investment, and can find problems more accurately. In all general IP networks can be applied.

In addition to the above method and device, an embodiment of the present invention also provides a system for establishing a DSCP mapping relationship between network elements, including a local network element and a peer network element, wherein the local network element can be the The device serving as the local network element and the peer network element may be the device serving as the peer network element in the foregoing embodiments. It can be understood that, if the foregoing device embodiments are positioned as the local network element, the system includes that the DSCP detection of the local network element is the opposite network element.

The technical solution of the present invention can obtain the following beneficial effects:

1. The detection triggering mechanism of the embodiment of the present invention can adopt manual triggering, periodic triggering or event triggering mechanism, and the configuration is flexible, as long as it is triggered, there is no need to manually intervene in the whole detection process.

2. The embodiment of the present invention can dynamically negotiate link building and tearing down, and there are corresponding event messages for abnormal situations, which effectively helps users locate faults.

3. In the embodiment of the present invention, when performing bidirectional detection, one detection can establish a mapping relationship table at both ends at the same time. After the detection is completed, the mapping relationship tables at both ends are verified to ensure accuracy.

4. The embodiment of the present invention has no limitation on the type of detection channel, and can detect on any type of channel between network elements, and these channels include direct physical links, virtual circuits, tunnels, MPLS LSPs, multi-hop routing channels, and Indirect channel.

5. The entire detection process of the embodiment of the present invention can be deviated from the detection of multiple DSCP values. An NE can establish multiple detection groups with multiple NEs at the same time.

6. The solution of the embodiment of the present invention has a wide range of applications, and can be used in the fields of wireless terrestrial transmission, digital communications, and mobile networks. As long as IP technology is used in the entire transmission process, it can be used without additional modifications. It can realize point-to-point detection or end-to-end detection.

7. The solution of the embodiment of the present invention adopts an automatic detection method, avoiding a large amount of manual intervention, low maintenance cost, simple and fast operation, and effectively obtaining corresponding results.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented through computer programs to instruct related hardware, and the programs can be stored in a computer-readable storage medium. During execution, it may include the processes of the embodiments of the above-mentioned methods. Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM) or a random access memory (Random Access Memory, RAM), etc.

The above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention, and are not intended to limit them; although the embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still understand the foregoing The technical solutions recorded in each embodiment are modified, or some of the technical features are replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (19)

1. a method for establishing a DSCP mapping relationship between network elements, characterized in that, the method comprises: Receiving a DiffServ coded DSCP message, the payload of the DSCP message contains the first DSCP value to be detected, and the header of the DSCP message contains the first DSCP value to be detected. The second DSCP value obtained after inter-element transmission; According to the first DSCP value contained in the payload of the DSCP message and the second DSCP value contained in the header of the DSCP message, establish the first DSCP value to be detected between the network elements The DSCP mapping relationship; Wherein, when the DSCP mapping relationship between the network elements is: when the first DSCP value that needs to be detected by the opposite end network element is a DSCP forward mapping relationship from the opposite end network element to the local end network element; the local end network element is The destination network element that receives the message, and the opposite network element is the source network element that initiates the message; The receiving DSCP message includes: The local network element receives the DSCP detection message sent by the peer network element. The payload of the DSCP detection message contains the first DSCP value that the peer network element needs to detect. The header of the DSCP detection message Contains the second DSCP value obtained after the first DSCP value is transmitted from the peer network element to the local network element; According to the first DSCP value contained in the payload of the DSCP message and the second DSCP value contained in the header of the DSCP message, establishing the first DSCP value to be detected in the network DSCP mapping relationship between elements, including: According to the first DSCP value in the payload of the DSCP detection message and the second DSCP value in the header of the DSCP detection message, the local network element establishes the first DSCP value that the peer network element needs to detect DSCP forward mapping relationship from the remote NE to the local NE. the 2. method according to claim 1, is characterized in that, described method also comprises: The local network element replies a DSCP detection response message to the remote network element, and the DSCP detection response message includes the DSCP forward mapping relationship. the 3. method according to claim 2, is characterized in that, described method also comprises: Receive the DSCP mapping relationship verification message sent by the peer network element, the mapping relationship verification message includes the DSCP forward mapping relationship obtained by the peer network element; Compare whether the DSCP forward mapping relationship contained in the mapping relationship check message is consistent with the DSCP forward mapping relationship established by the local network element; Return a verification response message to the peer network element, and if inconsistent, include the correct DSCP forward mapping relationship in the verification response message. the 4. method according to claim 1, is characterized in that, described method also comprises: Before performing DSCP detection, the local network element negotiates with the peer network element to establish a communication link for DSCP detection; and/or, After the DSCP detection process ends or the detection process is interrupted, the local network element negotiates with the peer network element to tear down the communication link of the DSCP detection. the 5. A method for establishing a DSCP mapping relationship between network elements, characterized in that the method comprises: Receiving a DiffServ coded DSCP message, the payload of the DSCP message contains the first DSCP value to be detected, and the header of the DSCP message contains the first DSCP value to be detected. The second DSCP value obtained after inter-element transmission; According to the first DSCP value contained in the payload of the DSCP message and the second DSCP value contained in the header of the DSCP message, establish the first DSCP value to be detected between the network elements The DSCP mapping relationship; Wherein, when the DSCP mapping relationship between the network elements is: when the first DSCP value that the local network element needs to detect is a DSCP backward mapping relationship from the peer network element to the local network element; the local network element is The destination network element that receives the message, and the opposite network element is the source network element that initiates the message; The receiving DSCP message includes: The local network element receives the DSCP detection response message returned by the peer network element. The payload of the DSCP detection response message contains the first DSCP value that the local network element needs to detect. The DSCP detection response message contains The message header contains the second DSCP value obtained after the first DSCP value is transmitted from the peer network element to the local network element; According to the first DSCP value contained in the payload of the DSCP message and the second DSCP value contained in the header of the DSCP message, establishing the first DSCP value to be detected in the network DSCP mapping relationship between elements, including: The local network element establishes the first DSCP value that the local network element needs to detect according to the first DSCP value contained in the payload of the DSCP detection response message and the second DSCP value contained in the header of the DSCP detection response message. A DSCP backward mapping relationship of a DSCP value from the peer network element to the local network element. the 6. The method according to claim 5, wherein, before the local network element receives the DSCP detection response message returned by the opposite network element, the method also includes: The network element at the local end sends a DSCP detection message to the network element at the opposite end, and the payload of the DSCP detection message carries the first DSCP value that the network element at the local end needs to detect. the 7. method according to claim 5, is characterized in that, described method also comprises: Send the established DSCP backward mapping relationship to the peer network element. the 8. method according to claim 5, is characterized in that, described method also comprises: Before performing DSCP detection, the local network element negotiates with the peer network element to establish a communication link for DSCP detection; and/or, After the DSCP detection process ends or the detection process is interrupted, the local network element negotiates with the peer network element to tear down the communication link of the DSCP detection. the 9. The method according to claim 8, characterized in that, before the local network element negotiates with the peer network element to establish a communication link for DSCP detection, the method also includes: The local NE or the peer NE as the DSCP detection activator triggers its own DSCP detection function. the 10. A device for establishing a DSCP mapping relationship between network elements, characterized in that the device comprises: The DSCP message receiving unit is used to receive a differentiated service coded DSCP message, the payload of the DSCP message contains the first DSCP value to be detected, and the header of the DSCP message contains the first DSCP value to be detected. The second DSCP value obtained after the first DSCP value is transmitted between the network elements; A mapping relationship establishing unit, configured to establish the first DSCP to be detected according to the first DSCP value contained in the payload of the DSCP message and the second DSCP value contained in the header of the DSCP message Values in the DSCP mapping relationship between the network elements; Wherein, when the DSCP mapping relationship between the network elements is: when the first DSCP value that needs to be detected by the opposite end network element is a DSCP forward mapping relationship from the opposite end network element to the local end network element; the local end network element is The destination network element that receives the message, and the opposite network element is the source network element that initiates the message; The DSCP message receiving unit is configured to receive a DSCP detection message sent by a peer network element, the payload of the DSCP detection message includes the first DSCP value that the peer network element needs to detect, and the DSCP detection The message header of the message contains the second DSCP value obtained after the first DSCP value is transmitted from the peer network element to the local network element; The mapping relationship establishment unit is used to establish the DSCP value that needs to be detected by the peer network element according to the first DSCP value in the payload of the DSCP detection message and the second DSCP value in the header of the DSCP detection message. The DSCP forward mapping relationship of the first DSCP value from the remote network element to the local network element. the 11. device according to claim 10, is characterized in that, described device also comprises: The DSCP message sending unit is configured to reply a DSCP detection response message to the peer network element, and the DSCP detection response message includes the DSCP forward mapping relationship. the 12. device according to claim 11, is characterized in that, described device also comprises: A verification unit, configured to receive a DSCP mapping relationship verification message sent by a peer network element, wherein the mapping relationship verification message includes the DSCP forward mapping relationship obtained by the peer network element; compare the mapping Whether the DSCP forward mapping relationship contained in the relationship verification message is consistent with the DSCP forward mapping relationship established by the local network element; return a verification response message to the peer network element, if inconsistent, then The verification response message contains the correct DSCP forward mapping relationship. the 13. The device according to claim 10, wherein the device further comprises: The link establishment negotiation unit is used to negotiate with the peer network element to establish a communication link for DSCP detection before performing DSCP detection; and/or, The disconnection negotiation unit is configured to negotiate with the peer network element to disconnect the communication link of the DSCP detection after the DSCP detection process ends or when the detection process is interrupted. the 14. A device for establishing a DSCP mapping relationship between network elements, characterized in that the device comprises: The DSCP message receiving unit is configured to receive a differentiated services coded DSCP message, the payload of the DSCP message contains the first DSCP value to be detected, and the header of the DSCP message contains the first DSCP value to be detected. The second DSCP value obtained after the first DSCP value is transmitted between the network elements; A mapping relationship establishing unit, configured to establish the first DSCP to be detected according to the first DSCP value contained in the payload of the DSCP message and the second DSCP value contained in the header of the DSCP message Values in the DSCP mapping relationship between the network elements; Wherein, when the DSCP mapping relationship between the network elements is: when the first DSCP value that the local network element needs to detect is a DSCP backward mapping relationship from the peer network element to the local network element; the local network element is The destination network element that receives the message, and the opposite network element is the source network element that initiates the message; The DSCP message receiving unit is used to receive the DSCP detection response message returned by the peer network element, the payload of the DSCP detection response message contains the first DSCP value that the local network element needs to detect, and the The header of the DSCP detection response message contains the second DSCP value obtained after the first DSCP value is transmitted from the peer network element to the local network element; The mapping relationship establishing unit is configured to establish a local network according to the first DSCP value contained in the payload of the DSCP detection response message and the second DSCP value contained in the header of the DSCP detection response message. The DSCP backward mapping relationship of the first DSCP value that the element needs to detect from the remote network element to the local network element. the 15. device according to claim 14, is characterized in that, described device also comprises: The DSCP message sending unit is configured to send a DSCP detection message to the peer network element, and the payload of the DSCP detection message carries the first DSCP value to be detected by the local network element. the 16. device according to claim 14, is characterized in that, described device also comprises: The mapping relationship sending unit is configured to send the established DSCP backward mapping relationship to the peer network element. the 17. The device according to claim 14, wherein the device further comprises: The link establishment negotiation unit is used to negotiate with the peer network element to establish a communication link for DSCP detection before performing DSCP detection; and/or, The disconnection negotiation unit is configured to negotiate with the peer network element to disconnect the communication link of the DSCP detection after the DSCP detection process ends or when the detection process is interrupted. the 18. The device according to claim 15, further comprising: The detection triggering unit is configured to trigger its own DSCP detection function when the device acts as a DSCP detection activator, before negotiating with an opposite network element to establish a communication link for DSCP detection. the 19. A system for establishing a DSCP mapping relationship between network elements, characterized in that it includes the device for establishing a DSCP mapping relationship between network elements as claimed in any one of claims 10 to 18, and the device for establishing a DSCP mapping relationship between network elements serves as The local network element, and the opposite network element of the DSCP detection of the local network element. the

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